Check the listing for details. NEW Rain Bird Transformer 635640 / 637567-01 ESPMIXFMR all ESP- M controllers.. Condition: New. Listed at 60.99 USD. You are currently bidding on a NEW OEM Rain Bird EXT 24VAC transformer (Part No. 635640 or 637567-01 ESPMIXFMR) which uses an input of 120VAC / 60Hz with an output of 24VAC @ 1000mA. The transformer is designed to be used in the following Rain Bird indoor sprinkler systems: ESP-M series controllers. The item has been fully tested in a production environment and is guaranteed to work 100%. I take great pride in selling every Rain Bird product I sell on eBay and this is reflected in my high feedback score. :-) Replacement transformer for indoor ESP4-M & all ESP-M series controllers. UL rated, Plug In Class 2 TransformerInput: 120VAC / 60 Hz Output: 25.5VAC / 1000mA If you have any questions, please contact me via email. Thank you and good luck on eBay.You are currently bidding on a NEW OEM Rain Bird EXT 24VAC transformer (Part No. 635640 or 637567-01 ESPMIXFMR) which uses an input of 120VAC / 60Hz with an output of 24VAC @ 1000mA. The transformer is designed to be used in the following Rain Bird indoor sprinkler systems: ESP-M series controllers. The item has been fully tested in a production environment and is guaranteed to work 100%. I take great pride in selling every Rain Bird product I sell on eBay and this is reflected in my high feedback score. :-) Replacement transformer for indoor ESP4-M & all ESP-M series controllers. UL rated, Plug In Class 2 TransformerInput: 120VAC / 60 Hz Output: 25.5VAC / 1000mA If you have any questions, please contact me via email. Thank you and good luck on eBay.